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Why is a calf born on Yom Tov permitted when an egg is muktzeh? The Gemara (גמרא) distinguishes between "huchan agav imo" (prepared via the mother's edibility) and "hoya muchan agav imah" (prepared via potential shchita of mother). The shiur analyzes whether shechting a ben bekur inside the mother creates a new heter shchita upon birth, and whether the calf's permitted status depends on the mother being omed l'achilah.
This shiur analyzes a complex shakla v'tarya in Beitzah 6a concerning the laws of muktzeh and nolad on Yom Tov. The Gemara (גמרא) distinguishes between an egg laid on Yom Tov, which is muktzeh, and a calf born on Yom Tov, which Rav holds is permitted. Rashi (רש"י) explains that the calf is not muktzeh because at birth it received a din that it could be shechted, thereby removing the issur muktzeh. The shiur emphasizes this is not the regular heter of "hoya muchan agav imo" (it was prepared via the mother) but rather that at birth, a new heter shchita came into being. The Gemara asks: Why doesn't the principle of "uchald afras" (separated from food) apply to permit the egg as well? The answer given is that the egg was muktzeh because of the blood it developed from, whereas the calf had "hoya muchan agav imah" - it was prepared through the mother. The shiur explores what this means: if you could have shechted the mother bein hashmashos, the fetus inside would have been mutar to eat, creating a form of hachanah even for the separate entity.
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Beitzah 6a
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